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Finding the Fourth Proportional to 301.16, 451.80 and 138.75

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Solution

The fourth proportional to 301.16, 451.80 and 138.75 is: 208.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.16 : 451.80 = 138.75 : x
  2. Step 2: Convert to fraction form
    301.16/451.80 = 138.75/x
  3. Step 3: Cross multiply
    301.16x = 451.80 × 138.75
  4. Step 4: Simplify right side
    301.16x = 62,687.25
  5. Step 5: Solve for x
    x = 62,687.25/301.16
  6. Step 6: Final answer
    x = 208.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.